C7 Industrial Engine Operation and Maintenance Manual – Battery Electrolyte Level – Check

When the engine is not run for long periods of time or when the engine is run for short periods, the batteries may not fully recharge. Ensure a full charge in order to help prevent the battery from freezing.

  1. Remove the filler caps. Maintain the electrolyte level to the “FULL” mark on the battery.If the addition of water is necessary, use distilled water. If distilled water is not available use clean water that is low in minerals. Do not use artificially softened water.


  1. Check the condition of the electrolyte with the 245-5829 Coolant Battery Tester Refractometer .


  1. Keep the batteries clean.Clean the battery case with one of the following cleaning solutions: 
    • A mixture of 0.1 kg (0.2 lb) of baking soda and 1 L (1 qt) of clean water
    • A mixture of 0.1 L (0.11 qt) of ammonia and 1 L (1 qt) of clean water

    Thoroughly rinse the battery case with clean water.

    Use a fine grade of sandpaper to clean the terminals and the cable clamps. Clean the items until the surfaces are bright or shiny. DO NOT remove material excessively. Excessive removal of material can cause the clamps to not fit properly. Coat the clamps and the terminals with 5N-5561 Silicone Lubricant, petroleum jelly or MPGM.

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